Having issues with my Pixel Tablet. May need terminology help.

So my tablet has started to act like it's possessed. Even when just sitting, it's like a ghost is touching the screen. This is after I did a factory reset because it was doing this and, additionally, it wouldn't even let me login from standby because when I'd got to type the code, it would select random other numbers.

I'm assuming this is a screen issue, but I don't know the technical term to start a return/claim.

Any help with the problem and the name of the issue would be appreciated.